﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Windows.Controls.Primitives;
using System.Runtime.InteropServices;
using System.Windows.Interop;

namespace PSE.Framework.UI.Controls.SmartClient
{
    public abstract class WindowBase : System.Windows.Window
    {
        #region WINDOWS MESSAGE LISTENER

        void win_SourceInitialized(object sender, EventArgs e)
        {
            System.IntPtr handle = (new WindowInteropHelper(this)).Handle;
            HwndSource.FromHwnd(handle).AddHook(new HwndSourceHook(WindowProc));
        }

        static System.IntPtr WindowProc(System.IntPtr hwnd, int msg, System.IntPtr wParam, System.IntPtr lParam, ref bool handled)
        {
            switch (msg)
            {
                case 0x0024:
                    WmGetMinMaxInfo(hwnd, lParam);
                    handled = true;
                    break;
            }
            return (System.IntPtr)0;
        }

        static void WmGetMinMaxInfo(System.IntPtr hwnd, System.IntPtr lParam)
        {
            MINMAXINFO mmi = (MINMAXINFO)Marshal.PtrToStructure(lParam, typeof(MINMAXINFO));

            int MONITOR_DEFAULTTONEAREST = 0x00000002;
            System.IntPtr monitor = MonitorFromWindow(hwnd, MONITOR_DEFAULTTONEAREST);

            if (monitor != System.IntPtr.Zero)
            {
                MONITORINFO monitorInfo = new MONITORINFO();
                GetMonitorInfo(monitor, monitorInfo);
                RECT rcWorkArea = monitorInfo.rcWork;
                RECT rcMonitorArea = monitorInfo.rcMonitor;
                mmi.ptMaxPosition.x = Math.Abs(rcWorkArea.left - rcMonitorArea.left);
                mmi.ptMaxPosition.y = Math.Abs(rcWorkArea.top - rcMonitorArea.top);
                mmi.ptMaxSize.x = Math.Abs(rcWorkArea.right - rcWorkArea.left);
                mmi.ptMaxSize.y = Math.Abs(rcWorkArea.bottom - rcWorkArea.top) - 1;
            }
            Marshal.StructureToPtr(mmi, lParam, true);
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct POINT
        {
            public int x;
            public int y;
            public POINT(int x, int y)
            {
                this.x = x;
                this.y = y;
            }
        }

        [StructLayout(LayoutKind.Sequential)]
        public struct MINMAXINFO
        {
            public POINT ptReserved;
            public POINT ptMaxSize;
            public POINT ptMaxPosition;
            public POINT ptMinTrackSize;
            public POINT ptMaxTrackSize;
        };

        [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Auto)]
        public class MONITORINFO
        {
            public int cbSize = Marshal.SizeOf(typeof(MONITORINFO));
            public RECT rcMonitor = new RECT();
            public RECT rcWork = new RECT();
            public int dwFlags = 0;
        }

        [StructLayout(LayoutKind.Sequential, Pack = 0)]
        public struct RECT
        {
            public int left;
            public int top;
            public int right;
            public int bottom;
            public static readonly RECT Empty = new RECT();
            public int Width
            {
                get { return Math.Abs(right - left); }
            }
            public int Height
            {
                get { return bottom - top; }
            }
            public RECT(int left, int top, int right, int bottom)
            {
                this.left = left;
                this.top = top;
                this.right = right;
                this.bottom = bottom;
            }
            public RECT(RECT rcSrc)
            {
                this.left = rcSrc.left;
                this.top = rcSrc.top;
                this.right = rcSrc.right;
                this.bottom = rcSrc.bottom;
            }
            public bool IsEmpty
            {
                get
                {
                    return left >= right || top >= bottom;
                }
            }
            public override string ToString()
            {
                if (this == RECT.Empty) { return "RECT {Empty}"; }
                return "RECT { left : " + left + " / top : " + top + " / right : " + right + " / bottom : " + bottom + " }";
            }
            public override bool Equals(object obj)
            {
                if (!(obj is Rect)) { return false; }
                return (this == (RECT)obj);
            }
            public override int GetHashCode()
            {
                return left.GetHashCode() + top.GetHashCode() + right.GetHashCode() + bottom.GetHashCode();
            }
            public static bool operator ==(RECT rect1, RECT rect2)
            {
                return (rect1.left == rect2.left && rect1.top == rect2.top && rect1.right == rect2.right && rect1.bottom == rect2.bottom);
            }
            public static bool operator !=(RECT rect1, RECT rect2)
            {
                return !(rect1 == rect2);
            }
        }

        [DllImport("user32")]
        internal static extern bool GetMonitorInfo(IntPtr hMonitor, MONITORINFO lpmi);

        [DllImport("User32")]
        internal static extern IntPtr MonitorFromWindow(IntPtr handle, int flags);
        #endregion

        #region Constructors

        public WindowBase() : base()
        {
            CommandBindings.Add(new CommandBinding(WindowCommands.Minimize, btnMinimize_Click));
            CommandBindings.Add(new CommandBinding(WindowCommands.Maximize, btnMaximize_Click));
            CommandBindings.Add(new CommandBinding(WindowCommands.Restore, btnRestore_Click));

            this.SourceInitialized += new EventHandler(win_SourceInitialized);
        }

        #endregion Constructors

        #region Drag/Drop

        public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            System.Windows.Controls.Grid header = this.GetTemplateChild("Header") as System.Windows.Controls.Grid;

            if (header != null)
            {
                header.MouseLeftButtonDown += new MouseButtonEventHandler(headerArea_MouseLeftButtonDown);
                header.GotKeyboardFocus += new KeyboardFocusChangedEventHandler(header_GotKeyboardFocus);
                this.MouseDoubleClick += new MouseButtonEventHandler(Window_MouseDoubleClick);
            }
        }

        /// <summary>
        /// Tratamento do double click no cabeçalho para maximizar / restaurar a janela
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void Window_MouseDoubleClick(object sender, MouseButtonEventArgs e)
        {
            System.Windows.Controls.Grid header = e.OriginalSource as System.Windows.Controls.Grid;

            if ((header != null) && (header.Name == "Header"))
            {
                if (this.WindowState == WindowState.Normal)
                {
                    this.WindowState = WindowState.Maximized;
                }
                else if (this.WindowState == WindowState.Maximized)
                {
                    this.WindowState = WindowState.Normal;
                }
            }
        }

        void header_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            this.MoveFocus(new TraversalRequest(FocusNavigationDirection.Next));
        }

        void headerArea_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
        {
            if (Mouse.LeftButton == MouseButtonState.Pressed)
            {
                this.DragMove();
            }
        }

        #endregion

        #region Minimize/Maximize

        protected void btnMinimize_Click(object sender, EventArgs e)
        {
            this.WindowState = System.Windows.WindowState.Minimized;
        }

        protected void btnMaximize_Click(object sender, EventArgs e)
        {
            this.WindowState = System.Windows.WindowState.Maximized;
        }

        #endregion

        #region Restore

        protected void btnRestore_Click(object sender, EventArgs e)
        {
            this.WindowState = System.Windows.WindowState.Normal;
        }        

        #endregion
    }
}
